Re: why does raidframe retry I/O 5 times

[buhrow%lothlorien.nfbcal.org@localhost (Brian Buhrow)]

        Hello.  While I agree with Manuel's assertion that the system becomes
stalled while all these retries are happening, I actually like all the
retries, because I've actually seen drives finally wake up and either remap
and write sectors they were complaining about, or figure out how to correct
the read error they were getting and deliver the data.  FreeBSD times out
much more quickly and loses drives seemingly more often.  I'd rather see
the wd(4) and raidframe(4) drivers made mp save which I think will address
the stalling issue, mostly, while retaining the persistent nature of the
current scheme.
-Brian

On Jun 25,  8:50am, Greg Oster wrote:
} Subject: Re: why does raidframe retry I/O 5 times
} On Mon, 25 Jun 2012 11:11:37 +0200
} Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
} 
} > Hello,
} > why does raidframe retry failed I/O 5 times ? the wd(4) driver already
} > retries 5 times, which means a bad block is retried 25 times.
} > While drivers are retrying the system is stalled ...
} 
} As I recall, for RAIDframe 5 was just chosen as an arbitrary number.  Do
} you know if scsi or other disk drivers also retry 5 times too?  
} 
} Later...
} 
} Greg Oster
>-- End of excerpt from Greg Oster